The Check validate abbreviations(consecutive capital letters) length in
identifier name, it also allows to enforce camel case naming. Please read more at
Google Style Guide to get to know how to avoid long abbreviations in names.

allowedAbbreviationLength specifies how many consecutive capital letters are
allowed in the identifier.
A value of 3 indicates that up to 4 consecutive capital letters are allowed,
one after the other, before a violation is printed. The identifier 'MyTEST' would be
allowed, but 'MyTESTS' would not be.
A value of 0 indicates that only 1 consecutive capital letter is allowed. This
is what should be used to enforce strict camel casing. The identifier 'MyTest' would
be allowed, but 'MyTEst' would not be.

Option allowedAbbreviationLength indicates on the allowed amount of capital
letters in abbreviations in the classes, interfaces,
variables and methods names. Default value is '3'.

Option allowedAbbreviations - list of abbreviations that
must be skipped for checking. Abbreviations should be separated by comma,
no spaces are allowed.

Option ignoreFinal allow to skip variables with final modifier.
Default value is true.

getAcceptableTokens

The configurable token set.
Used to protect Checks against malicious users who specify an
unacceptable token set in the configuration file.
The default implementation returns the check's default tokens.